With 1200rallycars help I've got the same set up (s12+8 and u12 rotors) on my 120y. Even fits my 13" ssr's with no mods to caliper. Running r31 disc rear end, 7/8 master and no booster

does anyone know the distance between the GTR r32
4 spot caliper bolt up holes? as they might bolt up
to r31 rear caliper brackets.
http://www.ebay.com.au/itm/NISSAN-R32 ... ories&hash=item27bc65c2eb
I even like the rear ones for a 1000.
http://www.ebay.com.au/itm/Nissan-Sky ... ories&hash=item588e4d9943

What is the size of the rotor after it has been machined 10mm smaller?

i havent used any spacers, new U12 discs are perfect width for caliper (but dont remember the measurement) can measure though

the surfs used the same s12+8 as well, cant be 100% sure what model mine are off, but i have gotten a few sets over time, always described as hi-lux calipers

i am running stock 1200 coupe master with no booster on rally car (that is using vanette drums on rear, which are larger than stock 1200 ones) brake bias is quite good

i am running stock 1200 coupe master on the raod car with bluebird disc over drums on rear, that has rear bias, so a brake bias valve installed on the rear line would be handy
engineer has recommended minimum 7/8 inch master for this setup, but i haven't fitted one yet, (this could mean an increased pedal force is required and therefore need a booster) but i have been running for years on stock 1200 master with no problems

to be clear..... for this all to fit.....:

caliper bolts straight to strut
disc needs precise redrilling to mount to hub
caliper needs grinding around outside to fit under 13" wheels
pads need grinding to clear the centre section of the disc

a brand new set of pads (cheap standard pads) on the front of the rally car lasted 3 rally seasons before being low enough to warrant replacement.... so they dont work very hard, and we have never had brake fade from them either, that includes stages that are 20-30kms long with the majority down steep hills, i think we have had the discs glowing red though

You have mail,almost forgot i also use 15mm spacers

Yes not thinking. Spacing would be better idea as would not have problems with pad clearance

You could also mill up a few spacers as the caliper are made of two halves. I have done this before so that I could accomodate a wider rotor. Longer fasteners are also used.

Good to see I have created a bit of discussion and have learnt things from it.
Yes the rotors are solid 13mm rotor.
The calipers are stamped S12+8 but I can't slip in much wider rotors because the cut out is about 18mm.
Can I machine this cut out wider to accommodate a 22mm wide rotor.(is this what you had to do rc1200?)

Cheers
Bob

A big solid rotor won't cause brake fade on a street car in most driving situations. The bigger rotors shed heat pretty fast on such a light car as the 1200.

Now if you are racing a road circuit that is a different story.

1200rc, they would be hilux calipers not land cruiser ones. They are pretty much the same caliper but the hilux ones are designed for a solid rotor instead of a vented one. So you would have actually been running 60 or 75 series calipers on your car not hilux ones. As far as I know no hilux came with the staggered piston calipers on a vented disc

Old_school. Can't really speak for running drums. But with disc all round and a 240k master cylinder I ran a willwood proportioning valve otherwise the rears would always lock up